This upscale, personal-training-only gym caters to those who want the full-service treatment in a gym experience. Reactive prides itself on providing everything you need to promote a healthy lifestyle, including personal trainers, a licensed nutritionist and a massage therapist. The location is a bit hidden, at the end of a nondescript shopping plaza, but once you're inside, the feel is very much that of a modern oasis -- dedicated to exercise, of course.